src/srinesh/algorithms/q17_migratory_birds/Solution.java
<filename>src/srinesh/algorithms/q17_migratory_birds/Solution.javaimport java.io.*;
import java.math.*;
import java.security.*;
import java.text.*;
import java.util.*;
import java.util.concurrent.*;
import java.util.function.*;
import java.util.regex.*;
import java.util.stream.*;
import static java.util.stream.Collectors.joining;
import static java.util.stream.Collectors.toList;

class Result {

    /*
     * Complete the 'migratoryBirds' function below.
     *
     * The function is expected to return an INTEGER.
     * The function accepts INTEGER_ARRAY arr as parameter.
     */

    public static int migratoryBirds(List<Integer> arr) {
		return arr
			.stream()
			.collect(Collectors.groupingBy(k -> k, Collectors.counting()))
			.entrySet()
			.stream()
			.sorted((e1, e2) -> {
				if(e1.getValue() < e2.getValue()) {
					return 1;
				} else if(e1.getValue() > e2.getValue()) {
					return -1;
				}

				return e1.getKey() < e2.getKey() ? -1 : 1;
			})
			.findFirst()
			.get()
			.getKey();

    }

}

public class Solution {
    public static void main(String[] args) throws IOException {
        BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(System.in));
        BufferedWriter bufferedWriter = new BufferedWriter(new FileWriter(System.getenv("OUTPUT_PATH")));

        int arrCount = Integer.parseInt(bufferedReader.readLine().trim());

        List<Integer> arr = Stream.of(bufferedReader.readLine().replaceAll("\\s+$", "").split(" "))
            .map(Integer::parseInt)
            .collect(toList());

        int result = Result.migratoryBirds(arr);

        bufferedWriter.write(String.valueOf(result));
        bufferedWriter.newLine();

        bufferedReader.close();
        bufferedWriter.close();
    }
}
